here is the thing. if you have cash, these are the best in their fields:
556 = G&G. Ive read a lot of good reviews about it. Looks like a solid build and a great gun. upgraded, the thing should shoot real nice
416 = VFC (Vega Force Company). This company makes the best 416 hands down. you wont be disappointed. Stock, it will serve you well (probably better than G&G). Once upgraded, it doesn't matter. It all depends on the upgrades you put into each.